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Finding the Fourth Proportional to 541.89, 811.32 and 387.28

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Solution

The fourth proportional to 541.89, 811.32 and 387.28 is: 579.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    541.89 : 811.32 = 387.28 : x
  2. Step 2: Convert to fraction form
    541.89/811.32 = 387.28/x
  3. Step 3: Cross multiply
    541.89x = 811.32 × 387.28
  4. Step 4: Simplify right side
    541.89x = 314,207.57
  5. Step 5: Solve for x
    x = 314,207.57/541.89
  6. Step 6: Final answer
    x = 579.84

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.